Delete message SMS

Hello,
Why I can't delete message SMS from AirDroid Web?
I have phone Sony Xperia Z2 with Android 5.1.1 and computer with Windows 10. When I want delete message showing a info: "Android does not support removing an SMS to Android 4.4" but I have 5.1.1?
Thank you

Hello,
Why I can't delete message SMS from AirDroid Web?
I have phone Sony Xperia Z2 with Android 5.1.1 and computer with Windows 10. When I want delete message showing a info: "Android does not support removing an SMS to Android 4.4" but I have 5.1.1?
Thank you

Hi, if your android OS is 4.4 and up, sorry that as Google has changed the mechanism of Android4.4+, deleting SMS from AirDroid is not supported by the current version. We'll make improvements in future versions. Kindly stay tuned.